Firefox Support Forum

Open this url https://openfde.com/intro.mp4 and firefox shows "video can't be player because this file is corrupt".

Web Console logs: ``` Media resource https://openfde.com/intro.mp4 could not be decoded. intro.mp4

Media resource https://openfde.com/intro.mp4 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_DECODE_ERR (0x806e0004) Details: void mozilla::AppleVTDecoder::OnDecodeError(OSStatus): OnDecodeError:ffffcd9a intro.mp4 ```

`ffmpeg -i` with this video file: ``` Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/path/to/intro.mp4':

 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf58.76.100
 Duration: 00:01:51.77, start: 0.000000, bitrate: 3243 kb/s
 Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 4096x2304 [SAR 1:1 DAR 16:9], 3109 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
   Metadata:
     handler_name    : ?Mainconcept Video Media Handler
     vendor_id       : [0][0][0][0]
 Stream #0:1[0x2](eng): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
   Metadata:
     handler_name    : #Mainconcept MP4 Sound Media Handler
     vendor_id       : [0][0][0][0]

```

Chrome is fine.

I set the browser to Open previous windows and tabs at restart, on General settings, but it always opens blanc, not saving any tab from the previous session.

How can I correct this issue, if it is one, please?

I had to totally rebuild my system from the bottom up. I had a copy of my old profile stored in the cloud, so I figured I was OK. When, I copied the files from the saved profile to my new profile, everything came over except my bookmarks. I copied the places.squlite and favicons.squlite files (which I understood to contain my bookmarks) separately and pasted them separately into the new profile, but to no avail. I used to keep a separate backup of my bookmarks, but when I learned that the bookmarks were kept in the profile, I stopped. How far up the creek have I gotten myself stuck, and is there a way to restore my bookmarks?

Whenever I open Firefox, it opens every tab from my previous session. I don't want this - if I closed the window, it was because I wanted it closed, and I don't need any automated system to re-open everything on the off chance I was wrong. I believe the setting for this is on the General tab, but as you can see in the attached screenshot, it's definitely off, yet the feature won't go away. I also tried changing the config settings, as listed here:

https://askubuntu.com/questions/1285172/firefox-always-restores-windows-and-tabs-after-reboot

, but it had no effect.

How do I stop Firefox opening these tabs without permission?

For whatever reason, I can't find a simple way to file a bug report. Starting 120.0, or maybe in 120.0.1, I've started seeing a cursor appearing next to buttons and other components on web pages that you definitely would not expect to see cursors next to.

It seems that a cursor has started to display when I click on web components even if it's not a text entry field. I've included a screen shot that includes a cursor appearing next to the Refresh button in Gmail, for example.

There's even a cursor appear in the "Browse" button on this very page in the Add Images section.

I frequently use GroupMe on desktop from Firefox, on two separate computers (a self-built desktop, and a Dell Latitude laptop).

Starting sometime over a week ago, I have been unable to drag & drop or otherwise upload photos in my chats. The only method that works is pasting direct URLs of JPGs.

In all other circumstances, I get the uploaded image error attached to this post.

Two different GroupMe support agents have said that, since image upload is still working in Edge, that it's a Firefox problem.

Tried clearing cache, site cookies, reset the browser, ran in troubleshooting mode...same result every time.

This is not the "image file size too big" error. I used to routinely post captures from the Snipping Tool, and I can't anymore.

I'm not sure where else to go to troubleshoot this. It's very annoying. Any suggestions?

Dark Reader works for all sites except for mozilla.org, I think these webpages are over-ridden by the Firefox browser? I saw a couple archived posts recommending global changes for all sites via Firefox -> Settings -> Language and Appearance -> Colors, or to install themes. Neither option would work. I don't want to override all sites to dark globally, that's way to much change, just let Dark Reader change just mozilla.org.

Hello, currently using 120.0.1 (64-bit) for macos and would like to know how to change behavior: When i'm trying to modify url in tab i'm currently working on and press enter/return it opens modified url in new tab for some reason. But when i hold option it opens it in current tab, is there any way to make it as default behavior? Thank you very much👍

I found how to backup and transfer my normal bookmarks, however I really need to backup and transfer my bookmark toolbar, specifically on the Mac version. I can only find the PC version instructions and they don't seem to translate between OS's.

WILL YOU STOP THAT PATRONISING "HMM, WE'RE HAVING TROUBLE FINDING THAT SITE" MESSAGE NOW

IT IS OBVIOUS THAT IT SHOULD SIMPLY SAY " NO INTERNET CONNECTION" IT IS INFURIATING.

DO IT NOW OR I WILL KILL MYSELF.

Since approximately July 2023, Firefox gives me a beachball and pauses for about 10 seconds whenever I change between it and another app, or between one Firefox window and another. The same behavior does not occur with other browsers, likewise whether my connection is WiFi or wired.

I have No Proxy set in Network Settings. I am running a 2021 M1 Max Macbook Pro on Ventura 13.5.2.

I would appreciate any advice on how to troubleshoot and fix. Thanks.

Hello to everybody, My question: Opening local .mdb files (MS Access database) does no longer work in Firefox 120, but was ok in previous releases. The only choice is to save the file rather than onening it with MS access. Under Firefox settings/applications the file type .mdb does not appear. If I answer the question "What should Firefox do with other files?" with "Ask whether to open or save files" it has no effect at all. I expect to find an entry for .mdb files where to choose "always ask" as was the case earlier. Please help!

Regards Volker Zipp

As Firefox was acting up I was going to uninstall and reinstall. It was suggested that I "refresh" it instead. Following that "refresh" my tabs bar is missing. How do I get it back? Also now the address bar is below the bookmarks bar. I can live with that but I need the tabs bar. FFOX 120.0.1 on Windows 11

The topic says it all. How do I prevent Firefox from shifting my typing from the search field to the address bar?

I try to type a search into the field on my homepage but the cursor gets shunted up to the address bar and I can't find a setting turn it off. I would prefer my typing to stay where I place the cursor with a click rather than being shunted off somewhere else on the screen.

Whenever I open Firefox on Chrome OS, which I installed via the Linux shell terminal, it says in settings that the browser is managed by my organization. However, I don't have a school account signed in or anything.

Hi,

I am a student, who tend to mass download files at once. The annoying part is that after every download, firefox automatically opens up the downloaded file in a new tap. How can I disable automatically open files after download?

Thanks.

Extract media links is displayed in the firefox right context menu I want to hide it from the right context menu. What should I do. Can't it be hidden? Firefox Version 120.0.1 64bit Windows11 Home 23H2

I can't see the SYNC option in Settings so I...

Use about:config to change identity.fxaccounts.enabled = true I can now see 'Sync' in Settings When I go to "Sign into Sync", after I enter my password, it hangs for 10 seconds, then says Working, then always just hangs there forever. If I login to Mozilla using a different tab, it signs in ok.

I have tried this after successfully changing the password, and after restarting firefox.

I am using the latest Firefox version.

Any suggestions gratefully accepted.

I've spent many hours trying to fix this problem. When I click on a document that I want to view, it is downloading to my computer. I have the latest version of firefox on a windows 11 pc. Please assist.

Hi--

I recently upgraded from Mojave to Sonoma 14.2, and Firefox 120.0.1.

In Mojave, fn-F12 used to invoke a "Dashboard" with applets like Dictionary and Thesaurus.

With Sonoma, fn-F12 causes the bottom part of Firefox's frontmost window to become a web developer tool, same as ⌥⌘I, instead.

Can I get my Dictionary and Thesaurus back?

--Gil